JPH0683607B2 - Sensitive float structure in walkable paddy work vehicle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sensing float structure in a walk-behind paddy work vehicle such as a rice transplanter, a fertilizer applicator, and a seeder.

[Problems to be Solved by Prior Art and Invention] Generally, in this type of walk-type paddy field vehicle, sensing floats are arranged on both front and left and right outer sides of the main float, and the sensing flow is uneven on the tiller. Thus, there is a system in which the horizontal attitude control of the airframe is performed by detecting that the body swings upside down.

By the way, in a walk-behind paddy field vehicle, the front part of the main float is grounded to carry out the traveling work of the aircraft,
As a result, it is preferable to widen the forehead of the main float to widen the ground contact area to facilitate the rounding work. On the other hand, in order to improve the straightness when planting, the sliding surface should be narrow. Preferably. Therefore, it is known that the shape of the main float is such that the forehead is wide and the rear is narrow.

Then, in arranging the sensing float on the side of the main float having such a shape, it is attempted to arrange it on the side of the wide frontal head 10a of the main float 10 as shown in FIG. 11 (B). There is. However, in this case, since the muddy water flow path X formed between both floats is formed corresponding to the wide portion position, it will inevitably flow backward in a state close to the adjacent planted seedling row N. In addition, when the body rolls left and right, the outer edge of the main float floats and sinks, but a large wave Y is generated due to the sinking and lifting of the rear corner 10c of the front head 10a. Then, the wave Y propagates in a state where it spreads outward and to the rear without being substantially blocked by the sensing float 11, which means that the mud flow path X is rearward in a state close to the adjacent planted seedling N. Combined with the flow, it has a great effect on the adjacent seedlings, and there is a problem that the seeded seedlings are pushed down or disturbed by the mud that can be stopped.

On the other hand, as shown in FIG. 11 (C), the sensing float 11
Is proposed to be extended to the rear to cover the rear corner portion 10c, but the mud flow path X is still close to the adjacent seedling row N and the corner is based on the left and right rolling. Muddy water wave Y generated from part 10c
The fact that the sensing float must be unnecessarily long to prevent it from spreading rearward and outward would be practically unacceptable.

[Means for Solving the Problems] The present invention was conceived with the object of providing a sensing float structure in a walk-behind paddy work vehicle capable of eliminating these problems in view of the above circumstances. When arranging the sensing float on the outer side of the part from the wide part to the narrow part of the main float where the front part is wide and the rear part is narrow, the sensing float is divided into the front part and the rear part. Is bulged to the main float side, the inner edge of the sensing float on the main float side is configured to substantially follow the outer edge shape of the main float.

Further, according to the present invention, the influence of the muddy water flowing between the main float and the sensing float on the existing seedlings can be reduced as much as possible.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine body of a walk-behind rice transplanter which is an example of a paddy field vehicle, an engine 3 is provided in a front portion of a body frame 2 of the traveling machine body 1, and a seedling mounting table 4 is provided in a rear portion thereof. The provision of members such as the planting claw 5 and the driving handle 6 is the same as conventional ones. Further, 7 is a traveling wheel, 8 is a chain case, 9 is a bonnet, and these are also conventional.

A main float 10 is mounted below the machine body frame 2, and sensing floats 11 are arranged on both left and right front portions of the main float 10. The front part 10a of the main float 10 is wide so that a large ground contact area can be secured when the aircraft is traveling, and the sliding surface is wide at the rear part 10b in order to improve straightness when planting. It has a narrow shape. On the other hand, the sensing float 11 is arranged on the outer side of the portion from the frontal portion 10a to the rear portion 10b of the main float 10, but the outer edge of the sensing float 11 is substantially linear in the front-back direction. The inner edge shape is such that the front part 11a is along the outer edge of the wide front head part 10a of the main float 10, and the rear part 11b is the narrow rear part 1 of the main float 10.
The middle portion is bent along the outer edge of 0b, and the rear portion 11b bulges toward the main float 10. Moreover, the draining bottom surface of the sensing float 11 has a shape constricted inward with the outer edge of the sensing float 11 as the top so that muddy water positively flows and guides into the gap between the sensing float 11 and the main float 10. . The bracket 12 is integrally attached to the front portion 11a of the sensing float 11,
The bracket 12 is pivotally supported by a front end portion of a support frame 13 which is integrally fixed to the body frame 2 side and extends from the engine base 3a side via a support shaft 12a so as to be vertically swingable. Then, the sensing float 11 has a rear portion 11b, which is in a low position, swings up and down following the unevenness of the cultivator. A support shaft 14 is further rotatably supported on the middle portion of the support frame 13 via a bracket 13a so as to be rotatable about its axis. The outer end of the support shaft 14 has a narrow width of the sensing float 11. The sensor float 11 is extended to the upper surface portion, and the upward movement of the sensing float 11 is restricted to a range until the sensing float 11 contacts the support shaft 14. Further, the lower end of the guide plate 15 is pivotally supported by the pin 5a on the rib 11d formed on the upper surface of the rear portion (rearward of the support shaft 14 portion) of the sensing float 11, and the length formed on the guide plate 15 is increased. The support shaft 14 is slidably fitted in the hole 15b, and is configured to serve as a guide when the sensing float 11 swings up and down.

A link 16 is attached to the front bracket 12 of the sensing float 11.
The upper end portion of the is integrally fixed, while a link 17 is further pivotally supported on the support shaft 14 so as to be vertically swingable. A connecting link 18 is interposed between one arm 17a of the link 17 and the lower end of the link 16. Further link above
The lower end of the sensing rod 19 is swingably connected to the other arm 17b of the rocking rod 17. And when the sensing float 11 is swung up and down around the axis of the support shaft 12a following the unevenness of the cultivator,
Link 16, link 18, link 17 linked to this swing
The sensing rod 19 is adapted to perform an up / down sensing operation by the link operation of. Incidentally, 20 is a bumper integrally provided on the engine base 2a, but is separate from the support frame 13 to which the sensing float 11 is attached.

On the other hand, reference numeral 21 denotes a lifting control cylinder whose cylinder cylinder 21a side is integrally attached to the machine body frame 2 side through an appropriate fixing member such as a bracket 2c.
In the cylinder 21, the cylinder rod 21b extends and contracts rearward, and the center portion of the balance arm 22 is provided at the tip of the cylinder rod 21b.
It is mounted so that it can swing horizontally via a. Both ends of the balance arm 22 are connected to the chain case 8 side via a connecting rod 23. The balance arm 22 is constructed so that when the lifting control cylinder 21 extends and contracts, the machine frame 2
While being guided by the guide rod 24 integrally assembled to the side, the vertical movement of the traveling wheels 7 is performed at the same time by performing the forward and backward movement, thereby performing the vertical movement control of the machine body.

A holder slidably attached to the guide rod 24.
A return type horizontal control cylinder 26, in which both ends of a cylinder rod 26a are fixed, is provided at 25. Also holder
The tip of the arm 25a protruding from 25 is swingable at the base end of the arm 22b integrated on the balance arm 22 side at a position substantially coaxial with the support shaft 22a of the balance arm 22 via a pin 22c. On the other hand, a pin 26c projecting from a cylinder tube 26b of the horizontal control cylinder 26 is engaged with a long hole 22d formed at the tip of the arm 22b. And as will be described later, the horizontal control valve 28
The horizontal control cylinder 26 performs a displacement operation in the left-right direction of the cylinder tube 26b by switching the
The reference numeral 22 horizontally swings about a support shaft 22a as a fulcrum, whereby the left and right traveling wheels 7 move upside down in a contradictory manner to horizontally control the machine body. 25b is a guide hole for the pin 26c formed in the holder 25.

Reference numeral 27 denotes a lifting control valve integrally attached to the front part of the lifting control cylinder 21, and the valve 27 is connected to the vertical movement detection following the change of the main surface of the main float 10, for example. It is composed of a lift control cylinder 21.
The horizontal control valve 28 is integrally provided on the side of the lifting control valve 27 (on the left side in the embodiment) via a connecting plate 29, a bolt 29a, and other appropriate connecting members. Is installed in. Further lift control valve 27
The bracket 30 is integrally fixed to the upper surface of the bolt 30a by a bolt 30a.
A support shaft 32 is formed on the shaft. On the other hand, 33 is a plate-like swing arm having a substantially U-shape in a plan view, and a central portion of the swing arm 33 is integrally provided with a substantially inverted L-shaped auxiliary plate 33a toward the rear. ing. In the swing arm 33, the support shaft 32 swings the tip of the auxiliary plate 33a and the swing arm 33 in a state where the bent tip end of the auxiliary plate 33a is slidably applied to the support plate 31. It is supported so as to be swingable up and down around the support shaft 32 by penetrating therethrough. At both ends 33b of the swing arm 33, an operating shaft 34 is pierced and supported so as to be rotatable around the shaft center in a state where movement in the shaft center direction is restricted by an E pin 34b. . A mounting piece 30b is formed on the bracket 30 so as to be bent rearward, and a mounting hole 30c for mounting the fuel tank 35 is formed in the mounting piece 30b.

One end portion of the swing arm 33 extends long toward the horizontal control valve 28 side assembled to the side of the lifting control valve 27 as described above, and the extension pin 33c is connected to the connecting pin 33d. The spool 28a of the horizontal control valve 28 is fixed via the. As will be described later, the swing arm 33 swings up and down with the support shaft 32 as a fulcrum to push and pull the spool 28a, thereby switching the horizontal control valve 28. In the neutral state, that is, when the sensing float 11 is in the same height posture on both the left and right sides, the swinging arm 33 is oriented in the horizontal direction in a front view, the support shaft 32, and the connecting pin of the spool 28a. 33b has an arrangement configuration in which it is located substantially on the same straight line and at substantially the same height.

Furthermore, the vertical swing of the swing arm 33 is configured as follows. That is, the base end portions of the link plates 34a are integrally fixed to the left and right end portions of the operating shaft 34 described above, and one end of the link plate 34a is a piece of the substantially L-shaped adjuster plate 36. Are pivotally connected to each other via a pin 36a. Further, on the other piece of the adjuster plate 36, the upper end portion in which the screw groove 19a of the sensing rod 19 is engraved is provided with a nut 19b.
It is attached by loose fitting so that the rod length can be adjusted. When the left and right sensing floats 11 oscillate reciprocally due to the unevenness of the cultivator, the oscillating arm 33 is supported by the reverse movement of the sensing rod 19 which is interlocked with it. The shaft 32 swings up and down about a fulcrum, which pushes and pulls the spool 28a to control the switching of the horizontal control valve 28, and the traveling wheel 7 on the sensing float 11 side that has moved upward moves downward. The horizontal control cylinder 26 is operated so that the balance arm 22 swings toward the side where it is moved. By the way, when the sensing float 11 swings up and down at the same time, the actuating shaft 34 is absorbed by being rotated about the axis of the swing arm 33.

The pipe 37 from the horizontal control valve 28 to the horizontal control cylinder 26 extends from the outer side surface of the horizontal control valve 28, traverses the lifting control cylinder 21, and crosses the cylinder tube 26b from the opposite side.
It is arranged in a substantially S-shape reaching up to, and the return pipe from the horizontal control valve 28 to the transmission case 38 side.
The pipe 39 is arranged along the outside of the side frame of the engine air cleaner 40 arranged in front of the lift control valve 27 so as to bypass the side frame, and positively cools the return oil.

In the embodiment of the present invention configured as described above, in the main float 10, the frontal head 10a is formed wide so as to ensure a wide ground contact area when the aircraft is traveling, while ensuring straightness at the time of planting. The rear part 10b is narrow so that it can be, but the sensing float 11 arranged on the outer side of the part from the wide part to the narrow part has an inner edge of the outer edge of the main float 10. The rear portion 11b is bent so as to bulge toward the main float 10 side so as to follow the shape. As a result, the muddy water flowing between the main float 10 and the sensing float 11 as the aircraft travels, is bent into the sensing float 11
The inner edge of the main float 10 forces it to move toward the narrow rear portion 10b side of the main float 10 that is far from the planted seedling row N, and the muddy water that has passed over the sensing float 11 remains along the outer edge of the main float rear portion 10b. As it flows backward, the muddy water flow path X becomes distant from the planted seedling row N.

Moreover, when the aircraft 1 rolls left and right, the muddy water waves generated from the rear corner portion 10c of the main float front head portion 10a are swelled toward the main float 10 side and the sensing float rear portion.
This is surely blocked by 11b so that the wave is extinguished, and this and the fact that the muddy water flow path X flows backward along the narrow part of the main float far from the planted seedling row N are combined. Therefore, it is possible to reliably prevent the muddy water from affecting the already planted seedling row N.

Moreover, since the rear part 11b of the sensing float 11 bulges toward the main float 10 side and is wide, a substantial ground contact area is increased, which greatly improves the sensitivity of the sensing float 11. Therefore, the accuracy of the horizontal attitude control can be improved.

Further, in the draining portion 11c of the sensing float 11, since the inner edge is scooped with the outer edge portion so as to positively guide the muddy water to the gap side with the main float 10, the muddy water also flows to the planted seedling side here. It will be possible to prevent pushing down.

Further, with respect to the sensing float 11, its upward movement is restricted by the support shaft 14 to which the link 17 to which the lower end of the sensing rod 19 is connected is pivoted, and the swing guide of the sensing float 11 is supported. It is formed by the guide plate 15 that is accommodated in the shaft 14, but even if the guide plate 15 is reversed because the sensing float 11 has largely moved up, its corresponding part of the sensing float 11 is cut out. Since it is connected, there is no problem. As a result, the swing height of the sensing float 11 can be made large, and the followability of the sensing float 11 with the biting to the biting is greatly improved.

Moreover, since the sensing float 11 is attached to the support frame 13 which is separate from the bumper 20, even if the bumper 20 collides with an obstacle and is deformed, normal sensing operation can be performed regardless of this. Become. Moreover, since there is a gap between the bumper 20 and the support frame 13, it is convenient to carry out a quick packing operation by passing the rope through this gap during packing or the like. Moreover, since this gap is located rearward of the front end of the main float 10,
The separation has virtually no effect.

[Advantages] In summary, since the present invention is configured as described above, the main float has a wide forehead and can secure a wide ground contact area when the aircraft is traveling, The rear part is formed with a narrow width to ensure straightness at the time of planting, but the sensing is arranged with a gap outside the part from the wide part to the narrow part of the outer edge of the main float. The float has a shape in which a rear portion bulges toward the main float so that an inner edge of the float extends along an outer edge of the main float. As a result, the muddy water flowing through the gap between the two floats actively flows along the outer edge of the main float that bends inward in the process from the wide part to the narrow part of the main float. The road is far from the planted row.

Moreover, when the aircraft rolls left and right, muddy water waves generated from the rear corners of the front part of the main float must be reliably blocked and canceled by the rear part of the sensing float that bulges toward the main float. This, and the fact that the mud flow path is allowed to flow along the main float width narrow part far from the planted seedling row and flow backward, the mud affects the seedling row. It can be surely prevented, and orderly planting can be performed.

In addition, since the sensing float has a wide rear part that actually touches the rice field and bulges toward the main float side, the ground contact area is wide, which can greatly contribute to the improvement of sensitivity.

[Brief description of drawings]

The drawings show an embodiment of a sensing float structure in a walk-behind paddy work vehicle according to the present invention, wherein FIG. 1 is a side view of a walk-behind rice transplanter, FIG. 2 is a plan view of the same, and FIG. Is a front view of the horizontal control mechanism, FIG. 4 is a side view of the sensing float, FIG. 5 is a side view of the frame without the sensing float, FIG. 6 is a plan view of the same as above, and FIG. 7 is for horizontal control. FIG. 8 is a perspective view of the valve section, FIG. 8 is a plan view of the control cylinder section, FIG. 9 is a side view of the same, FIG. 10 is a front view of the same, and FIG. 11 (A) is an explanatory view showing the flow of muddy water in the present invention. , (B) are explanatory views showing the flow of muddy water in the conventional example, and (C) is an explanatory view showing the flow of muddy water in the case where the sensing float is extended rearward. In the figure, 1 is a traveling body, 10 is a main float, and 11 is a sensing float.

Claims (1)

[Claims] 1. When arranging a sensing float on the outer side of a portion from a wide portion to a narrow portion of a main float having a wide front part and a narrow rear part, the sensing float is provided with:
Walking type paddy field work characterized in that the front part is narrow and the rear part bulges to the main float side, and the inner edge of the sensing float on the main float side is configured to substantially follow the outer edge shape of the main float. Sensing float structure in the car.